US PATENT SUBCLASS 131 / 216
.~.~ Special smoke passages


Current as of: June, 1999
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131 /   HD   TOBACCO

329  DF  TOBACCO USERS' APPLIANCE {8}
330  DF  .~ Device used for smoking {21}
216.~.~ Special smoke passages {2}
217  DF  .~.~.~> Spiral passage
218  DF  .~.~.~> Plural reversely extending


DEFINITION

Classification: 131/216

(under subclass 330) Smoking devices claiming the construction of the smoke passage.

(1) Note. Compare this class, subclass 201 and indented subclasses.

SEE OR SEARCH CLASS

428, Stock material or Miscellaneous Articles, appropriate subclasses, for a stock material in the form of a single or plural layer web or sheet, and especially

292.1+, for a composite web or sheet including a layer containing structurally defined fibers, and subclasses 364+ for a fiber or filament which is structurally defined (e.g., crimped, specific cross-section) or is coated.